A technique for hi-speed indentation experiment based on Hopkinson bar

摘要

A new technique for hi-speed indentation experiment based on Hopkinson bar is presented. The ball projectile is accelerated with high pressure air gun and the Hopkinson bar is used for impact force measurement. The whole indentation displacement and force history can be obtained with this new technique. For accurately measuring the force pulse with several microseconds duration, a finite element simulation is carried out using ABAQUS for determining the transfer function of the bar. Then, the transformation function is used for reproducing the fore pulse. It gives much better results compared to traditional method base on 1-D or quasi 1-D stress wave theory. It is possible that the new technique holds feasibility and accuracy.